33138291 has 16 divisors (see below), whose sum is σ = 45440640. Its totient is φ = 21468480.

The previous prime is 33138283. The next prime is 33138307. The reversal of 33138291 is 19283133.

It is not a de Polignac number, because 33138291 - 2³ = 33138283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (33138211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51216 + ... + 51858.

It is an arithmetic number, because the mean of its divisors is an integer number (2840040).

Almost surely, 2^33138291 is an apocalyptic number.

33138291 is a deficient number, since it is larger than the sum of its proper divisors (12302349).

33138291 is a wasteful number, since it uses less digits than its factorization.

33138291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106.

The product of its digits is 3888, while the sum is 30.

The square root of 33138291 is about 5756.5867491075. The cubic root of 33138291 is about 321.2008622427.

The spelling of 33138291 in words is "thirty-three million, one hundred thirty-eight thousand, two hundred ninety-one".